Hemodynamic stress activates inflammatory responses and cell death through spectrin-dependent modulation of Store Operated Calcium Entry

Abstract

AbstractCirculating blood cells, such as leukocytes, experience significant hemodynamic stresses. These stresses are significantly higher when a patient requires mechanical support of the circulation, such as cardiopulmonary bypass. To identify molecular mechanisms by which cells sense these stresses, we utilized genome wide CRISPRi and phosphoproteomics data. These screens identified non-erythroid spectrin 1 (SPTAN1) and RAF1 as effectors of hemodynamic stress in monocytes. We show that fluid stress induces SPTAN1/RAF1 signaling to promote STIM1 and ORAI1 interaction resulting in Store-Operated Calcium Entry (SOCE) thereby driving inflammation and cell death.